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Re: [PATCH v1 01/11] ci: prevent grub unpacking initramfs
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 3 Apr 2025 14:03:33 +0200
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- Cc: Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 03 Apr 2025 12:03:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.04.2025 13:39, Andrew Cooper wrote:
> On 03/04/2025 12:29 pm, Jan Beulich wrote:
>> On 03.04.2025 13:04, Marek Marczykowski-Górecki wrote:
>>> It fails on larger initramfs (~250MB one) and sometimes even smaller
>>> depending on memory size/memory map, let Linux do it.
>> Iirc grub only unpacks gzip-ed modules, so wouldn't a yet better approach
>> be to use a better compressing algorithm, which simply as a side effect
>> would keep grub from decompressing it, while at the same time moving
>> farther away from any critical boundaries?
>
> Yes and no.
>
> This is going to change anyway when I (or a delgee) moves initrd
> generation from the test step itself into the test artefacts repo.
>
> Switching to a slower algorithm will impact every test step right now.
>
> Real systems doesn't see this in general, because it there's an
> uncompressed microcode container at the front, and it's not identified
> as being compressed at all.
>
> I'd prefer to stick with Marek's patch in the short term.
Fair enough.
Jan
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